Searchable abstracts of presentations at key conferences in endocrinology

ea0065oc2.4 | Neuroendocrinology, Pituitary and Neoplasia | SFEBES2019

Investigating the role of vagal Y2R in PYY3-36-mediated appetite suppression

Alonso Aldara Martin , Cork Simon C , Ma Yue , Herzog Herbert , Bloom Stephen R , Distaso Walter , Murphy Kevin G , Salem Victoria

Introduction: The gut hormone peptide YY 3-36 (PYY3-36) is secreted postprandially from intestinal L-cells to signal satiety. Peripheral administration of PYY3-36 suppresses food intake in rodents and humans. PYY3-36-based drugs are therefore promising anti-obesity treatments. It has been proposed that circulating PYY3-36 supresses appetite via the Y2 receptor (Y2R) in the hypothalamic arcuate nucleus (ARC). The vagus nerve, the majo...

ea0015p281 | Reproduction | SFEBES2008

Pre-analytical factors affecting measurement of plasma kisspeptin by radioimmunoassay

Ramachandran Radha , Patterson Michael , Murphy Kevin G , Dhillo Waljit S , Patel S , Kazarian A , Ghatei Mohammad A , Bloom Stephen R

Background: Kisspeptin is a peptide product of the KiSS-1 gene and a key regulator of the hypothalamo-pituitary-gonadal axis. Pregnancy is associated with raised plasma kisspeptin concentrations. However, there is significant variation in the plasma kisspeptin levels quoted in previous studies. We investigated the effects of pre-analytical factors including processing time and anticoagulant type on plasma kisspeptin-immunoreactivity (IR) measurement.Meth...

ea0086op4.1 | Metabolism, Obesity and Diabetes | SFEBES2022

The effects of a tripeptide hormonal infusion on sweet taste function and eating behaviour

Behary Preeshila , Alessmii Haya , Miras Alexander , Tharakan George , Alexiadou Kleopatra , Purkayastha Sanjay , Moorthy Krishna , R Ahmed Ahmed , Bloom Stephen R , Tan Tricia M

Background: Roux-en-Y Gastric Bypass (RYGB) results in sustained weight loss. Changes in food preferences and eating behaviour are postulated as possible contributing mechanisms. Post-RYGB, patients consume less sugary and fatty food. Sweet taste detection and sensitivity have been reported to be enhanced post-surgery and this may account for changes in the palatability of food. Underlying mechanisms for the changes in sweet taste function and eating behaviour are unclear....

ea0044p196 | Obesity and Metabolism | SFEBES2016

L-Phenylalanine modulates gut hormone release, and suppresses food intake in rodents via the Calcium Sensing Receptor

Norton Mariana , Alamshah Amin , Spreckley Eleanor , Kinsey-Jones James S. , Amin Anjali , Li Fanyi , Canisius Ishani , Johnson Rebecca , Akalestou Elina , Malik Zainab , Bloom Stephen R. , Murphy Kevin G.

High protein diets suppress appetite, but are difficult to adhere to. Understanding how the gut senses protein may identify mechanisms to drive satiety. Amino acid products of protein digestion are thought to be sensed by G protein coupled receptors in the gut, including the calcium sensing receptor (CaSR). Calcium ions are the major ligand of the CaSR, but aromatic amino acids, particularly L-phenylalanine (L-Phe), allosterically modulate CaSR activity....

ea0031p187 | Obesity, diabetes, metabolism and cardiovascular | SFEBES2013

Acute effects of co-infusion of peptide YY (3–36) and glucagon-like peptide-1 on insulin secretion and insulin sensitivity

Tan Tricia , Salem Victoria , Troke Rachel , De Silva Akila , Alsafi Ali , Misra Shivani , Baynes Kevin , Ghatei Mohammed , Minnion James , Field Ben , Godsland Ian , Bloom Stephen R

The amelioration of type 2 diabetes and sustained weight loss after bariatric surgery are thought to be due to elevated circulating levels of the gut hormones peptide YY3–36 (PYY3–36) and glucagon-like peptide-1 (GLP-1). GLP-1 augments the insulin response to an oral glucose load. PYY3–36 has appetite-inhibitory effects and contributes to longer-term weight loss. Rodent studies provide conflicting data regarding the effects of PY...

ea0025p269 | Reproduction | SFEBES2011

Kisspeptin-54 injection stimulates activity of the human GnRH pulse generator in healthy women

Jayasena Channa N , Comninos Alexander N , Misra Shivani , Ali Abbara , Aniket Tavare , Donaldson Mandy , Ghatei Mohammad A , Bloom Stephen R , Dhillo Waljit S

Background: Kisspeptin is a novel hypothalamic hormone with powerful stimulatory effects on the hypothalamo-pituitary–gonadal (HPG) axis. Inactivating mutations in the kisspeptin receptor lead to pubertal failure. We have previously demonstrated that injection of kisspeptin-54 stimulates LH release in healthy men and women. Recent studies in animals suggest that endogenous kisspeptin may be involved in stimulating the GnRH pulse generator. Determining whether exogenous ad...

ea0044oc1.3 | Early Career Oral Communications | SFEBES2016

Investigating the interaction between KNDy peptides on gonadotrophin release in humans – novel findings with therapeutic importance

Narayanaswamy Shakunthala , Prague Julia K , Jayasena Channa N , Papadopoulou Deborah A , Mizamtsidi Maria , Shah Amar J , Bassett Paul , Comninos Alexander N , Abbara Ali , Bloom Stephen R , Veldhuis Johannes D , Dhillo Waljit S

Background: Hypothalamic KNDy neurons have recently been identified as key regulators of reproductive function by releasing three neuropeptides namely kisspeptin, neurokinin B (NKB) and dynorphin. Animal studies show they interact to control pulsatile GnRH release, which is vital for fertility. In animals, kisspeptin stimulates, NKB modulates and the opioid dynorphin inhibits GnRH pulsatility. However, the interaction of these peptides has never been studied in humans. To inve...

ea0025oc4.7 | Bone and diabetes | SFEBES2011

Co-administration of the gut hormones PYY and GLP-1 to human volunteers reduces food intake and brain activation in appetite centres

De Silva Akila , Salem Victoria , Long Christopher J , Makwana Aidan , Newbould Rexford D , Rabiner Eugenii A , Tavare Aniket N , Ghatei Mohammed A , Bloom Stephen R , Matthews Paul M , Beaver John D , Dhillo Waljit S

The physiological post-prandial release of the gut hormones PYY and GLP-1 is implicated in triggering CNS mechanisms underlying satiety. However, the combined effects of PYY and GLP-1 on brain circuits underlying satiety in humans remain unknown.Objective: To determine changes in CNS neuronal activity following single and combined infusions of PYY and GLP-1, using blood oxygen level dependent functional magnetic resonance imaging (BOLD fMRI) in human vol...